# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.101881        0.00147804    
     0.460000          0.700000          0.112627        0.00149739    
     0.700000           1.00000          0.117557        0.00175210    
      1.00000           1.54000          0.129761        0.00204934    
      1.54000           2.40000          0.142626        0.00289653    
      2.40000           4.80000          0.151034        0.00414162    
      4.80000           10.0000          0.159162        0.00640878